feat(storage): carry an archived version's mime type through the query

The API returns it and the mapper dropped it, so nothing downstream could
tell an image from a PDF. The archived preview needs it to render.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N3euXsz25sTybsGTcxCFfn

apps/studio/data/storage/versioning/archived-objects-query.test.ts

@@ -9,7 +9,7 @@ const row = (overrides: Record<string, unknown>) =>
     updated_at: '2026-01-01T00:00:00Z',
     created_at: '2026-01-01T00:00:00Z',
     last_accessed_at: '2026-01-01T00:00:00Z',
-    metadata: { size: 100 },
+    metadata: { size: 100, mimetype: 'image/jpeg' },
     ...overrides,
   }) as any
 
@@ -30,6 +30,8 @@ describe('toArchivedObjects', () => {
     expect(archived[0].path).toBe('folder/photo.jpg')
     expect(archived[0].archivedAt).toBe('2026-02-01T00:00:00Z')
     expect(archived[0].currentVersion.versionId).toBe('v1')
+    // The preview needs it to decide what to render.
+    expect(archived[0].currentVersion.mimeType).toBe('image/jpeg')
   })
 
   it('ignores a live object', () => {

apps/studio/data/storage/versioning/archived-objects-query.ts

@@ -14,6 +14,8 @@ export interface ArchivedObjectVersion {
   size: number
   createdAt: string
   action: ObjectVersionAction
+  /** What the preview renders from. A delete marker carries no metadata. */
+  mimeType?: string
 }
 
 export interface ArchivedObject {
@@ -43,6 +45,7 @@ const toVersion = (object: StorageObjectV2, action: ObjectVersionAction) => ({
   size: Number(object.metadata?.size ?? 0),
   createdAt: object.created_at ?? object.updated_at ?? '',
   action,
+  mimeType: object.metadata?.mimetype ?? undefined,
 })
 
 /** An object is archived when the row currently at its path is a delete marker. */